Linux Blog

testgl

NAME

SYNOPSIS

DESCRIPTION

Demo program for
vgagl(7)
framebuffer library. Runs in any mode preset
from the environment.

First draws pixels in random locations, then
random boxes, then random lines and finally some bit image in random
locations (all just over the previous drawings).

Then the
test is repeated clipping the screen output to a smaller screen
portion (using a
vgagl(7)
function). Finally a (lousy) 'rotating'
linux logo is shown in the top left quadrant and then is drawn
over the whole screen.
Depending on internal development state of svgalib, it may use an
accelerator for some of the functions.

You can set a videomode
to use by setting the environment variable
SVGALIB_DEFAULT_MODE
to a number (see vgatest
for a list) or a string like G0x1x2 where you replace 0 with desired x
resolution, 1 with the desired y rez, and 2 with the desired number of
colors (2, 16, 256, 32K, 64K, 16M, 16M4). Again, only certain choices are
available, see vgatest for a list.

In case nothing is selected, G320x200x256 is choosen.

This demo is part of svgalib and can be found in the
demos/
subdirectory of the original svgalib distribution. However, it is not installed in the system
by default, s.t. it is unclear where you can find it if your svgalib was installed by some
linux distribution. Even then, when you have the demo on your system, you probably won't have
the sources s.t. it is only of limited use for you.

In case of any such problem, simply get an svgalib distribution from the net. You even
don't need to install it. Just
make
in the
demos/
subdirecty. As of this writing,
svgalib-1.2.12.tar.gz
is the latest version and can be retrieved by ftp from
sunsite.unc.edu at /pub/Linux/libs/graphics
and
tsx-11.mit.edu at /pub/linux/sources/libs
which will most probably be mirrored by a site close to you.